Re[2]: [zfs-discuss] ditto blocks for use data integrated in b61

2007-03-21 Thread Robert Milkowski 
Hello Richard,

Wednesday, March 21, 2007, 1:48:23 AM, you wrote:

RE Yes, PSARC 2007/121 integrated into build 61 (and there was much rejoicing 
:-)
RE I'm working on some models which will show the affect on various RAID
RE configurations and intend to post some results soon.  Suffice to say, if
RE you have a stripe with  1 disk, you might be able to survive loss of a
RE disk.  There are some other details which will need to be fleshed out, too.
RE More importantly, positioning this relative to the other options can be
RE confusing, and we're working on clear explainations to help avoid over-
RE exuberance.

Also I guess it would be possible to change copies once file system is
created, right? If it's so then people could get confused about which
data are protected and to what extent and which are not.

Perhaps 'zfs rewrite' would possibly help (someone working on this?).

-- 
Best regards,
 Robertmailto:[EMAIL PROTECTED]
   http://milek.blogspot.com

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Re[2]: [zfs-discuss] ditto blocks for use data integrated in b61

2007-03-21 Thread Robert Milkowski 
Hello Richard,

Wednesday, March 21, 2007, 6:23:05 PM, you wrote:

RE Robert Milkowski wrote:

RE Wouldn't that fall under the generic rewrite/shrink functionality we're also
RE anxiously waiting for?  Note that this also brings up a nasty edge case 
where
RE the rewrite may cause you to run out of space.
RE   -- richard


Yes, we're waiting for this :)

In most cases rewrite/shrink should inform admin if given operation is
possible in case of free space.
However it won't be probably possible with ditto block for data block
without actually scanning entire pool...

I guess that in such a case two options should be provided. 1) just to
go ahead and we will see what happens. 2) first scan entire pool and
give the answer.


-- 
Best regards,
 Robertmailto:[EMAIL PROTECTED]
   http://milek.blogspot.com

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